nitrex(tm) passive nitrogen removal systems
DESCRIPTION
A presentation about Nitrex(TM) Passive Nitrogen Removal Systems. Presented by Pio Lombardo with Lombardo Associates Inc. during a Buzzards Bay Coalition 2014 Decision Makers mini-workshop on nitrogen-reducing septic systems. Learn more at www.savebuzzardsbay.org/DecisionMakersTRANSCRIPT
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Pio Lombardo, P.E.Lombardo Associates, Inc.Newton, MA [email protected]
Nitrex TM Passive Nitrogen Removal Systems Achieving Total Nitrogen 3 mg/l
Workshop on Nitrogen Removing Wastewater Systems
Buzzards Bay Coalition
Buzzards Bay Center, 114 Front Street New Bedford, MA
March 5, 2014March 5, 2014
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Passive Lower Cost Alternative
Achieving TN < 5 mg/l,
averaging TN 3 mg/l
Can Produce TN < 2 mg/l &< 1
mg/l if desired / required
NitrexTM
3
Typical Residential Process Train
3
44
Malibu, CA Plaza Wastewater Process Flow Has Achieved TN < 2 mg/l for 3+ years
Grease Trap
Septic Tank
Recirculation Tank
NitrexTM 1st Stage Filter
NitrexTM Nitrogen Reduction Filter – 2nd stage
Polishing
Filter
Dispersal to Drainfields
Kitchen Sewer
Building Sewer
Produces Effluent Compliant with CA Title 22 Requirements for Unrestricted Water Reuse
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LaPine OR US EPA Study Results
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Suffolk County Alternative Wastewater Technologies NitrexTM Testing by SCDHS
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No. Site Name1st
sampling2nd
sampling Average1 Eastham MA 40 unit subdivision 1.33 1.37 1.352 Mashpee MA 24 unit subdivision with 5,200 sf commercial 0.54 1.57 1.0553 Harvard MA 2 family installation 0.63 1.4 1.0154 Malibu CA 16,000 gpd Shopping Center restaurants & retail 1.58 1.28 1.435 St. Leonard, MD single family installation 2.3 3.68 2.99
Average all sites 1.28 1.86 1.57
NitrexTM EFFLUENT TN (mg/l) Sampled by H2M
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Cluster / NeighborhoodWastewater Systems
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Residential & Light Commercial Nitrex™Wastewater System – Mashpee, MA
Effluent Total Nitrogen 3 +/- mg/lQuarterly Operator Visits
BIOFILTER
DRAINFIELD PUMP
STATION
SEPTIC TANK
NITREX™ FILTER
Mashpee, MA Wastewater System at Substantial Completion
BioFilter
NitrexTM Filter
Drainfield Pump Station
Mashpee, MA Wastewater System at Completion
1010
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Residential Development Producing Water with Total Nitrogen 2.2 mg/l
Eastham, MA 10,000 gpd design flow
Biofilter
NitrexTM Tanks
Drainfield
Drainfield
Septic Tank
NitrexTM Tank
Bio-filter
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Malibu Creek Plaza, Malibu, CA
Malibu Creek Plaza
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Malibu Village Plaza Wastewater System Configuration
Biofilters
1st StageRecirculation
Tank2nd Stage
Recirculation Tank
Discharge Tank
NitrexTM Tanks
EQ Tank
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Malibu Village Plaza Performance
Removes Emerging Contaminants
Operator Requirements – 4 hours per week
Continuous electronic monitoring accessible via
telephone/web
2008 4.90 3.04 3.31 1.44 2009 1.72 3.29 3.23 0.57 2010 1.90 2.23 2.82 3.02 2.71 2.98 0.38 0.54 2011 2.04 1.89 2.74 2.91 2.56 2.81 0.36 0.42
Annual Geo mean
3 yr Geo
Mean
TSS (mg/l) Turbidity (NTU)
3 yr Geo
Mean
Annual Geo
mean
Annual Geo mean
3 yr Geo Mean
3 yr Geo
Mean
Total Nitrogen (mg/l)
Annual Geo mean
BOD (mg/l)
Achieves Unlimited Reuse Standards
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Bogue Sound Elementary School & Croatan High School Newport, NC
Influent Quality:
TN 70 - 149 mg/l104 mg/l average
Average Effluent Quality:
TN 2.57 mg/lBOD5 < 2 mg/l TSS 8.1 mg/lFecal Coliform 8.8 MPN/100ML
• Sole source selected by NC Schools upon recommendation of North Carolina Dept. Natural Resources
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Individual Onsite Wastewater Systems
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2 Family Residential Nitrex™Wastewater System
Harvard, MA 660 gpd
BioFilter
Septic Tank
NitrexTM Filter
Drip Irrigation
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Residential Retrofit Installations – Maryland Producing TN 1.7 mg/l
BioFilter
Septic tank
NitrexTM Filter
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Nitrex™ Costs
•Total System costs for residential applications:
New/Complete System $28,000 - $35,000
Retrofit $20,000 - $25,000
•Large systems sized based upon:
•Total N to be removed – i.e. from 90 to 3 ppm of N
•Generally $50 - $75/gpd capacity for Turnkey Design-Build-Start-up
•Comparison with Conventional Systems
• Generally 10+/- % savings on capital costs
• 35+/- % savings on annual O&M costs
•Operational and Management simplicity
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Groundwater Treatment Options
Immediate Water Quality Benefit Addressing legacy issue of historical N discharges Natural flushing may take 5 - 30+ years after improvements made Estuarine Water Quality Standards
typically 0.35 mg/l TN Drinking water standard is 10 mg/l NO3-N
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NitrexTM PRB for Groundwater Treatment
Cross Section. NitrexTM PRB
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Waquoit Bay PRB
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November 2005, ~ 3.5 months after installationGroundwater Nitrate Removal in Waquoit Bay PRB
W1W2
W3 W4 W5 W6W7 W8
Relative Distance (m)
Rel
ativ
eE
leva
tion
(m)
0 2 4 6 8 10-4
-2
0
2
NO3- (M)1501301109070503010
PRB
Grade
Waquoit Bay
K. Foreman MBL, Woods Hole, MA 02543
2424
NITRATE AT WAQUOIT BAY DATA COLLECTED BY WOODS
HOLE MARINE BIOLOGICAL LAB (MBL)
Groundwater Flow
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Questions / Discussion
Pio Lombardo, P.E.